Hi Guys and Girls. New to the site and many thanks for that. Playing around with GRBL by Zap maker and arduino uno with a cnc shield. What I would like to change is $G View Paser state before it loads. Need to change the G21 to G20 and the feed rate. Can do this after it's loaded but a bit of a pain in the butt Have opened the HEX file but not to sure where to look And what to do. Thanks to all